Composite Non-Linear Seismic Sweeps for Vibrator Constraints
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Solution Overview
Problem
Seismic vibrators in the oil and gas industry face limitations in generating sweeps due to constraints imposed by their components, leading to inefficient use of energy, particularly at low and high frequencies, resulting in reduced signal quality and increased costs.
Innovation Solution
A method and system for generating composite non-linear sweeps that combine low-frequency and high-frequency sweeps, each optimized within the constraints of the seismic vibrator's components, to maximize energy output by limiting the amplitude of each sweep within its respective constraints, thereby increasing the total emitted energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a single sweep is used to cover the entire frequency range, then the frequency coverage is complete, but the energy efficiency is reduced due to component constraints at certain frequencies
Solution Approach 1:
The frequency range is segmented into multiple sub-ranges, with each sweep covering a specific frequency band optimized for particular vibrator component performance. Multiple sweeps are combined to achieve complete frequency coverage while maintaining energy efficiency in each segment.
Solution Approach 2:
The system dynamically selects and combines different sweeps based on the vibrator's operational constraints and desired frequency content. The composite sweep adapts the amplitude and timing of individual sweeps to maximize energy efficiency across the entire frequency range.
2Power
If the amplitude is increased to maximize energy output, then the energy output is improved, but operational constraints such as baseplate decoupling and displacement limits are violated
Solution Approach 1:
The amplitude parameter is dynamically adjusted for each sweep based on the frequency range and vibrator constraints. By changing the amplitude parameter across different sweeps rather than using a constant high amplitude, the system maximizes energy output while preventing baseplate decoupling and displacement limit violations.
3Measurement precision
If the sweep time is extended to improve signal quality, then the signal-to-noise ratio is improved, but the productivity is reduced due to longer data collection time
Solution Approach 1:
Multiple sweeps covering different frequency ranges are merged into a composite sweep that achieves the signal quality of longer individual sweeps while reducing the total time required. The combination of segmented sweeps provides sufficient signal-to-noise ratio without requiring excessively long sweep durations.
Data Source
AI summary
In accordance with some embodiments of the present disclosure, a method for generating composite non-linear sweeps adapted to vibrator constraints includes determining a target amplitude function, determining a constraint set including a constraint, selecting a scaling constant, calculating a low-frequency non-linear sweep based on the constraint set and the scaling constant, calculating a high-frequency non-linear sweep based on the constraint set, the scaling constant, and the low-frequency non-linear sweep, and calculating a composite non-linear sweep by combining the low-frequency non-linear sweep and the high-frequency non-linear sweep.